body {
    margin: 0;
}

.block {
    width: 25%;
    height: 25%;
}

.black {
    background: black;
}

.yellow {
    background: yellow;
}

.startText {
    color: white;
    font-size: 40px;
    text-align: center;
}

table {
    border-collapse: collapse;
}

#datetime {
    position: fixed;
    z-index: 10;
    top: 10px;
    font-size: 30px;
    color: red;
    left: 0;
    right: 0;
    text-align: center;
    text-shadow: 2px 2px 5px #111;
}

td {
    border: 1px solid gray;
}

#fail {
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: 10;
    top: 0;
    font-weight: 900;
}

.failDiv {
    height: 40%;
    margin: 40% 10%;
    text-align: center;
    background: white;
    width: 80%;
    border: 5px solid #444;
    border-radius: 30px;
}

.failText {
    margin: 5%;
    background: #ddddec;
    width: 90%;
    height: 30px;
    line-height: 30px;
    border-radius: 10px;
}

#score {
    font-size: 50px;
}

.time {
    padding: 20px
}

.again {
    width: 90%;
    height: 20%;
    font-size: 24px;
    background: black;
    color: white;
    border: 1px solid black;
    border-radius: 15px;
}